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By Andy Coghlan AFTER spending 120,000 years buried 3 kilometres deep in the Greenland ice sheet, a tiny bacterium has been coaxed back to life. And it may resemble bugs you would expect to find in ice on other planets. At its smallest, the rod-shaped bug is 0.5 by 0.3 micrometres – about 50 times smaller than the common microbe, Escherichia coli. “What’s unique is that it’s so small, and seems to survive on so few nutrients,” says Jennifer Loveland-Curtze of Pennsylvania State University, whose team described the new species,